#include "muduo/proto/codec.h"
#include "muduo/proto/dispatcher.h"
#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpServer.h"

#include "request.pb.h"
#include <iostream>
#include <unordered_map>

class Server
{
public:
    typedef std::shared_ptr<google::protobuf::Message> MessagePtr;
    typedef std::shared_ptr<bit::TranslateRequest> TranslateRequestPtr;
    typedef std::shared_ptr<bit::TranslateResponse> TranslateResponsePtr;
    typedef std::shared_ptr<bit::AddRequest> AddRequestPtr;
    typedef std::shared_ptr<bit::AddResponse> AddResponsePtr;
    Server(int port):_server(&_baseloop,muduo::net::InetAddress("0.0.0.0",port),
    "Server",muduo::net::TcpServer::kReusePort),
    _dispatcher(std::bind(&Server::onUnknownMessage, this,
     std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)),
    _codec(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher,
     std::placeholders::_1, std::placeholders::_2, std::placeholders::_3))
    {
        //注册请求处理函数
        _dispatcher.registerMessageCallback<bit::TranslateRequest>(std::bind(&Server::onTranslate, this,
         std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
 
        _dispatcher.registerMessageCallback<bit::AddRequest>(std::bind(&Server::onAdd, this,
         std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));  

         _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, &_codec,
         std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)); 

         _server.setConnectionCallback(std::bind(&Server::onConnection,this,std::placeholders::_1));
    }
    void start()
    {
        _server.start();//开始事件监听
        _baseloop.loop();//开始事件监控，这是一个死循环阻塞接口
    }
 
private:
    std::string translate(const std::string &str) 
    {
        static std::unordered_map<std::string, std::string> dict_map = {
            {"hello", "你好"},
            {"Hello", "你好"},
            {"你好", "Hello"},
            {"吃了吗", "油泼面"}
        };
        auto it = dict_map.find(str);
        if (it == dict_map.end()) {
            return "没听懂！！";
        }
        return it->second;
    }
    void onAdd(const muduo::net::TcpConnectionPtr& conn,const AddRequestPtr& message,muduo::Timestamp)
    {
        int num1 = message->num1();
        int num2 = message->num2();
        int result = num1 + num2;
        bit::AddResponse resp;
        resp.set_result(result);
        _codec.send(conn,resp);
    }
    void onTranslate(const muduo::net::TcpConnectionPtr& conn,const TranslateRequestPtr& message,muduo::Timestamp)
    {
        //1.提取message中的有效消息，也是需要翻译的内容
        std::string req_msg = message->msg();
        //2.进行翻译,得到结果
        std::string rsp_msg = translate(req_msg);
        //3.组织protobuf的相应
        bit::TranslateResponse resp;
        resp.set_msg(rsp_msg);
        //4.发送响应
        _codec.send(conn,resp);
    }
    void onUnknownMessage(const muduo::net::TcpConnectionPtr& conn,const MessagePtr& message,muduo::Timestamp)
    {
        LOG_INFO << "onUnknownMessage: " << message->GetTypeName();
        conn->shutdown();
    }
    void onConnection(const muduo::net::TcpConnectionPtr &conn)
    {
        if(conn->connected())
        {
            LOG_INFO << "新连接建立成功";
        }
        else
        {
            LOG_INFO << "连接即将关闭！";
        }
    }
private:
    muduo::net::EventLoop _baseloop;
    muduo::net::TcpServer _server;//服务器对象
    ProtobufDispatcher _dispatcher;//请求分发器对象--要向其中注册请求处理函数
    ProtobufCodec _codec;//protobuf协议处理器--针对收到的请求数据进行protobuf协议处理
};

int main()
{
    Server server(8085);
    server.start();
    return 0;
}